powell



se t. e.1927. 'i, 641,234"

W. T. POWELL MANUAL TELEPHONE SYSTEM Filed Mrch 15. 1924 ,3 Sheets-Sheet 1 l i l. l l I l I g a I REGISTER SELECTOR METER CUT OFF KEY INVENTOR WINFREP T POWELL BYA' - ATTORNEY- 1, 1, 4 Sept w. T. POWELL 64 23 MANUAL TELEPHONE SYSTEM Filed Marci 15. 1924 v 3 Sheets-Sheet 2 METER REL o R ECEIVER CONTROLLER INVENTOR WINFREPTPOWELLY ATTORNEY Sept. -6, 1927.

W. T. POWELL MANUAL TELEPHONE SYSTEM 3 Sheets-Shget 3 INVENTOR \JINFREPTPOWELL BY A ATTO NEY Filed March 15. 1924 The cams herein designated Ato D inclusive, are divided into four equal sectors. and the can s E to. inclusive are divided into. six sectors, asjshown, The positions otall. the cams L to U inclusive, are forthe purpose of starting the registration at the beginning ot the thousands digit s nce 1t is only possible to move the register control switch out of position 1- when' one of these cams is in. position 0 of its first revolution, During revolutions 2,3 and 4t, cam D will open so that it wilhbe, impossible to. start registering the thousands digit during the hu n dreds, tens or 'units cyclesl The shaft controlling cams A,'B', C and D isggearedtothe shaft controlling cams to U inclu si vey in a one to four ratioythat is, for each revolution of'the long shaft having a larger number of cams, the short one moves its small number ermine through one. ofits four cycles.

the upper right haudcorner of Fig. 3 there are represented two terminals 39 and '33, and these terminals may be in the. form uf pins or other contactsthat may be easily touched by the tip contact Ora plug. each operators position a ten thousand linesystern, there are providcdten thousand f these contacts such as 39 and 133, ar

tio'ni The contact such which is individual to a subscribers telephone line 13" iultipled throughout the contact banks at several opei atorisf-pesitions, much aftei'ithe, manner in which multiple picks are now wi red" inv the present telephone switchboards. Although it has been, st-aterl that a set of these terminals is provided for eachfopera-tor. it will be understood that a set of terminals may be provided for a pliii'ality of operators, provided ofco urse that a con tact bank is within easyreach otall of the operators. ii V i terminating at a second or distant oflicef Then the suhscriberjat l, originates acall by removing hisreceiver front its iswitchhook, the line relay 2 is operated over the two sides of the calling line in s eries and attracts it s arlnature t light-I'tlie line lamp 4. 'Tlieoperator oirnoting that th e lainp t is lighted inserts the: plug 5 into t he 6 otthe, calling l'i nei whereupon the relay 7 is operated from grounded battery. its left hand. high resistance winding, sleeve contacts of theplug and tlie 6-, wind ing of the cut-dfi relay 3 to ground. The cup-off relay is also energized in this. cir uit and at its ar'mat-ures and back contacts opens the mentioned circuit of the line re- "anged in a compact Contactbank one ofwhich is PTOVlClBLl for each operators P0813 was initially energized through its high re sistance winding and is thereat'tr-rr.held opcrated through its right hand winding. This arrangementprevents more than one operaiori rom sinnutaneously beingtelephoni-' Cally connected to the calling line. This is due to the fact that if a secondanswering plug similar to 5- is connected to a multiple jack oi the calling line, the high resistance winding of the relay such as 7'; of the second cord circuit will be connected in mul--- tiple with the low resistance winding of the relay '7 Of'thC first cord circuit.

is that the second mentioned relay 7 not operate.

i-is soon as the answering plug 5-has been connected to I, the calling line,' the answering super is'ory relay 8-is energized in a circuit does including both sides otthe answering end of the cord circiii t 'a ndboth sides ofthe willing line. i and prevents the lighting of the ai'iswering supervisory lamp 9 at this time. As soon asthe relay Sis operated a' circuit is closed t'roin grounded battery through the high ant low resistance windings in seriesot-relay lO; back contact and armature of re- .la yillfleft hand armature and front con tact of the s'upe rvisory relay 8, back contact continuityspring and winding ot slow releasing relay 12, inner back contact and armature or relay 13:, conductor 1%. inner.

left handfront contact and armature of relay 7 to ground;

The relay 12 does not operate in series with the high resistance winding of relav 10,:but the relay 10 isoperated in the last described circuit 'and at its inner armature and front contact, closes a circuit inde pendent of its high resistance winding. Th relay 12 does operate in series with the low resistance winding of relay 19 and when operated, closcs a locking circuit for itself from grounded battery, winding of relay ll urmature, continuity spring and' winding of relay 1 2, inner back Contact and arena: ture of relay 1'3 conductor 14, to ground at the armature and trout contact of relay 7. The relay lzl opena the circuit of relay'lO.

which relay common to all of the cord The result T -his operates the relay 8- 'relay is operated, the slow releasing operators cut-in relay is short-circuited by a circuit'completed through themeter cut-- off key 16, make contacts of relays" 10 and 12. Afterthej relay 11 opens the energizing circuit of the relay 10, this last namedrelay dccnergizes and When it opens the last mentioned ShOIiErClTCLHt efiects the operation of relay 15.v Theenerglzlng ClITCUll'JOLt re-.

lay 15 is from grounded battery, its Winding, innermost front contact of relay/12, and Wmdmg of position meter 17 to ground.

- Relay 15 is thus operated and at its front contacts and armatures connects'ithe op' erators telephone set to the calling telephone line. At this time the'supervisory lamp" 9 is dimly lighted-to indicate to the U operator to which cord circuit'her telephone set" is connected. The circuit for dimly lighting the lamp 9 extends from grounded battery, through the lamp, the leftv hand front contact and armature of 'relay8, inner relay 1'2, and winding of the position meter of the motor magnet 19in acircuitclosed from grounded battery, Iwinding of this magnet, its back contact and armature,

outermost front contact and armature ofv relay 12, innermost back contact and armature of relay '20,test brush 21 and test terminal 22 and through a'multipleterminal similar to' 22, through an a rmature and on a test terminal such as'g22.

frontcontactto ground at a relay similar to 20, at another cord circuit that has seized the register sender associated "With the test terminal. ilar circuits which indicate busy register senders, the motormagnet 19 advances the brushes Offthe register selector until anx idle register sender, is located" This condi tion is-indicated by the absence of ground During the time'that the register selector has been 'testingxbusy senders the'relay '20 is short-circuited,but When'an idle sender is located'the' relay 20 ene'rgizes 'and a-cir",

cuit is completed from ground,its inding middle armature and front contactof relay.

12, armature, back contact andW-inding of the motor magnet 19 togrounded-battery;

e The relay 20' on operation,'at-its inner right hand frontcontact and armature applies abusy'potentialto test terminals 22 to prevent the seizureof this selectedregister sender and closesacircuit foroperating the relay 148 of Fig. 3. 1 a f The operator on being" connected to the calling telephone lineasks the number of the wanted telephone line and On learning and Winding of Under control ofthis andsim a distant oflice, or. thesame ofiice, depresses one of theofiice keys shown in the lower right hand; corner of Fig. 1.

Let it be assumed that'the operator depresses key 23. "This efiects the operation that this Wanted telephone line terminates at of relay24 from grounded battery, its wind- I ing, contacts of key-23, conductor 25, outer right hand armature and front contact of relay 20, lowermost back contactand arm-a ture of relay'13, innermost back contact and armature of relay 26', toground. Relay 24 on operation closes a locking circuit for it-;

- self through its right hand front contact and armature, overthe'remainder of the circult just described, toground over conductor 25. Attheinnermost armature and front contact' 'ofrelay 24, a circuit is closed'fronrtact of relay 12,"bac'k contact, armature groundedbattery. The relay 29 energizes and closes a locklng circu t for itselfthrough itslnner armature and continuity spring,

which circuit is independent of the contacts of the relay 24:. At the upper frontcontacts andarmatures of relay 29, the register sender is connected to the calling end of I the-cord lcircuit. I r r 'It Willbe noted that the locking circuitofthe ofiice relay such as 24, is controlled.

through back contacts of relaysl3 and 26, SO' tl1tl3 when the calling" plug is inserted in; the trunkjack resulting in the operation ground, conductor 28, back contact, con tinuity spring andwinding of relay 29, con- 7 ductor 30,]middle armature and front cor.-'

motormagnet -19 t0,

of the relay 13, theoperated oiiice relay is "released. Also if an office key is accidentally operated when a calling line is not connected to'the operators"telephoneset, no

operation'of an oflice relay is effected. In .casethe' operator depresses-the Wrong office key by mistake she-may release the operated oflice relay byoperating the release key 37 j after which the propenoffice key no I may be operated. On' the other hand if'the registering orsending apparatus fails to operate, the operator may depress the re;

lease key and connect calls through her position by inserting'the called plug into the;

trunkfjack and passing the callorally over the selected trunk. Under sucha condition the relay 29 isn'ot operated and the, tip and 7 ring conductors'are not disconnected from the cord circuit, After selectin'gthe proper OfllCQtlTB operator holds the tip 38 of the calling plug in contact with the pin terminal39 of the Wanted line. It is assumed that the desig'a,

'nationof thewanted line is #l468, which .is represented'by one ofthe terminals 39,

[EUR

shown in the upper right hand; corner of Fig. 3; "Withthe tip of'the plug in engage mentwith the terminal 39, a circuit is closed from ground, Winding of. re1ay 40, registei I controller brush ll in its first .'pOSl.tiO11,lCQl1- ductor 42, selector 191 1151154. conductor 53, outermost armature and 'back contact of relay 26, conductor 43, uppermost front coir tact and armature of relay 29, tip contact 38, .pin contact 39(Fig. '3), right hand are to grounded battery, relay 31 is operated 111d "closes a 'locl-zir circuit forpitself {from ground through its left hand armature,

front contact and left hand Winding. conductor 15. A cam contactsto ground-ed bat-- tery. Relay 40 does not ope ate in series With relay 31, (but as soon as relay .31

' operated it extends the previously described testcircuit to the pin terminal .39 by way of the right hand armature and front contact of relay 31. inner armature and back ontactof relay 32, conductor e26, cam contactsO, D and F to grounded battery. Relay 40 is energized in this circuit and'closes anoperating circuit from ground, itsarmature and :front contact, register controller nush 4:7, in its first position, right .hand armature and front contact of relay 48, back contact, armature and Winding of the motor magnet 49 to grounded battery. This operating circuit actuates the motor magnet to advance the brushes &1, L7, 4.9 and 50 into their second position. Relay 3.1, at its left hand armature and front contact-also closes a circuit through the right hand Winding of relay but this relay does not operate until cam contacts C are closed, which is at the beginning of the second revolution of the cams E to U- inclusive.

lVrhen the code machine .rotates from the position 0, cam F disconnects battery and cam G connects ground to thecams H to U inclusive. The circuits are now in condition for recording the thousands digit, which in this instance is :fit, and it is necessary ,to actuate the relay 36 of the thousands relay register to store this designation. 7

lVith the register controller in position 2 and with the cams E to U inclusive, in position 1, the registration of .the thousands digit is effected. The cams H, I, J and vK, are those directly used to cpcratethe thou: sands register relays and in this position cam H closes its contacts, but the cam-con tacts O are open so that the relay 52 is not Operated and the circuit through cam contacts'H is therefore ineffective to operate any thousands register relay. (bile the menace code machine passes'through positions 2 and 3, .cams l and J close their respective contacts, but-as camiconta-cts O are open in :these positions, the relay 52 is not energized, With the result that relays 33, 34 and 35 of the thousands register remain in their normal position. hen, however, the code machine enters position 4,-cam contacts O are closed and a circuit is established from ground, cam contactsG, camcontacts 0, .back contact and armature of relay32, front contact and armature of relay I31, yin terminal 39, tip contact '38, upper armature and front contact of relay 29, conductor 1-3, outermost back contact and armature of relay 28, conductor 53, selector brush Set, conductor 42, controller brush 41 in its second position, Winding of relay 52 to grounded battery. Relay 52 is energized in this circuit and attracts its armatur-es. This last operation closes acircuit from ground at cam contacts G and K, conductor 55, innermost front contact and armature of relay 52 through the upper winding of relay 36 to grounded battery. The relay 36 when operated closes a locking circuit for itself through its lower Winding; front contact and armature :to ground ithrough the controller b1YUSl1 (19.

T he code machine inow rot-ates to position 5, Where it completes acircuit from ground, ca-in contacts E, conductor 61, register controller brush 4:? in position 2, right hand front contact and armature of relay 48,bacl1 contact, armature and Winding of motor magnet 49 to grounded battery. This circuit causes rthe motor magnet to .advance the controller rbru'shes into position hen the code jmachine rotates to the 0 position, which is the start of the second cycle, cam contacts D open and cam contacts B and C are closed; The contacts C extend grounded battery ifroi'ncam contacts F, conductor 56, right hand winding-01f relay 32, left hand frontcontact and armature of relay 31 to ground; Relay is operated in ithis cir cuit and locks Eitseljf operated :from ground at its left- :hand armature, "front contact and its lefthand Winding, Conductor .58, cam contacts B to grounded battery.

The test-circuit extending through the pin terminal '39 is HOW switched from the thousands 'to 'the hundreds register, which in the case assumed is -to record thewhundreds digit l. Since cam contacts TD are open, cam contacts 9 :are not connected :to battery during 'tihiscycleofrthe machine. Cam contacts 9 remain openduring the rotation of the anachine through {positions 1, 2 and 3, so that the relay 159 is :not operated during thatperiod. W;hen, hoWever,-the O cam is rotated to -position 4,:its contactsiare closed-to complete av circuit from ground, at cam contacts -G, cam contacts 0, conductor -60, rfront contacts and armatures of relays 32 and 31', over the :test circuit ineluding .thetip contact llfi . 38and the conductors'53 .andf42, controller brush ll in" its thirdlposition, Winding of relay 59 to battery. The operation, of relay- 59. advances the controller brush into posi tion ,4." The "relay 59is not disconnected from the controller brush .41v in its 4th posivti-on,--s o that it remains energized.-- At this time, a circuit is again closed from ground at cain contacts K, conductor innermost tront :contact and armature of relay I 59,

winding'of relay '36 to' grounded battery. [Relay 36 is operated :in this circuit and closes a locking circuit for. itself-through its lower \y1nd1ng, frontcontact and .arma ture to ground atcontroller brush 49; In

j position oflthe machine, cain contacts close a circuit fromground. conductor 61,

' controller brush 47 {in its -fourth'position Order,to effect!theregistration of this digit; 5 it is necessary to operateteiis relays33 and Cani Q, is notefi'ective' in its 0 position to coinp'let'e any} circuit; butin position 1 tion.

tion of the code machine, the cams on the long shaft inove to-positiono and since this is the beginning of the third cycle of opera right hand front contact andf-arinaturexof 'relay' 48,"back ;contact, armature andwindingjof the motor magnet 49 *to groundeda battery. The motor magnet then advances the; controller' bru'shes into their. fifth flposi At theclose' of this cycle-of opera tion, the group of cams on the Short shaft is assumed that the tens digit is #6.".In

and S gmund at CEt'IIl'COIlt-EICtS isfextended by Way of cam contacts Qand the'register 'controller(brushed in position '5 to operate thetens relay63; I This last-named relay noivu closes a. circuit for advancing the controller switch to position 6 ,Where relay 68 is'still maintained actuated.- Thisf advancing' cir-' r L cui't eiitend's from, grounded battery,windtionfii." Withthe relay 66 operated, Whileing oil-the motor inagnetfli); its armature and back contact, armature andffront contact of relay 48', v controller brush 47 units *fifth" position, right hand from contactand arinatureot relay 63, toground. qWhilethe cam 'con'tactsjQare closed in 1, the tens "regi's' ter rela esaiis "operated in a circuit closed from ground f at cam; contacts "G, scam "contacts H conductor-264;: outermost front *fconta'ct i and armature r of relayk 1 .63. "upper 'wind'ing of relay 38 to "grounded -bjatl tery." This relay on operation locks" itself in [this conditionQthrough its-lower frontconftajct andarmature to groundatg cont-roller brush .49. While the amqQfl vi s trotated through positions -2 it 'opensa circuit which has. been 1 energizing relay 6'3, so that-this v relay dcenerg1zes. -But when the cam contactsiQa're closedin' 3; the'relay 63'is again operated, in; whichcondition it operates'the tens register relay 35 in: a circuit traceable zfroinf grounded battery, upperwii ding of this relay, armatureand front contact of at ,controller brush .49. cam. contacts .E are closed to. complete a relay 63, conductor-'65, ca ncontacts J. and Gutolground, Relay'35 pn operation locks itself over the holding conductor to ground In position 5{the p )Circuit from ground over conductor 61,; con- I ,trollerbrush 47 in its. lXth position, right hand front "contact and armature of relay 48, back contact, armature and-Winding of the; motormagnet 4:9.t0 grounded battery. ZThiscircuit advances the controllerbrush 3' intopositionfi;

,The group oficams'o-n the long shaftnow rotates into position 0 and sincethis is the beginning of the fourth c ole; the groupof cams ,on'wthef. short sha t nov'ev to .POSi- 6 "tion' 4, In this position. cam f Bpdisconnects. battery from] conductor 58 which causes therelay 32 to "release; The test .lconductor completed throughthe plug contact 38 and:thelpinterminal- 39 is'n0W effective to register the units digiti i Which is ,,:/;,I:8. At this-timethe relaysBI and 32 areinactive. In Order to. register the units digititB, it-is necessary to operate. relays 33 34 and'35 While the cam G is'passing throughpositions 1,-"2 and 3,j a circuit is i J closed. from ground to cam contacts f S, conductor 4A; rightyhand Winding of jrelay 31,

right hand back contact-and armature-of relay 32, back contact and armatur'e'of-relay ..31fand thence over thetest circuit including the pin terminal 39,, tip Contact, 38', of the T plug, thence over conductors 53and' 42, con- ,trollerbrush 41 in its seventh position, Wind -1ing of relay 166 togroundedbatteryi; Relay 31: is'zinarginal. and-therefore does not opere ate'in serieswith thehigh resistancewinding;. of re'lay 66. Relay '66 does energize andon energization operates the motor. magnet 49 to advance the controllerbrushes intoposithe carncontacts Hare closed imposition 1, l v the relay '33? is operated from grounded battery, Winding. of this relay, outermost arma- 66 still operatedthe closurelof its circuit to cainlcontact's S [in positions 2' and ;3,--causes the relay 34 to be operated froin grounded "battery, its upper winding, .-front contact I and armatureiofrelayi66', conductor 67,"ca1n "contacts. and 'G" to ground. 5Sim'ilarly-,fthe "relay 359 is energizedfrom groundedf'battery its" upper winding,jar nature. and front contact of relay 66, conductor 65, cam contacts ELDdfG 'tOjig I'OLHId. Relay 359also 1ocks;

itself operated to ground at controller brush l9. hen the cam E closes its contacts again it completes a circuit over conductor 61, controller brush 4:7 in position 8, front contact and armature of relay l8, back contact, armature and winding of motor magnet 49 to grounded battery. This causes the motor magnet to advance the controller brush into position 9.

The registers are now setto record the number of the WHDtGCliLBlGPhOIlG line and a circuit is now established for lighting the oflice lamp, which is a visual indication to the A. operator that the plug may be removed from the test orpin terminal and inserted in the trunk jack. The operations of recording the wanted line designations, although the description has been rather lengthy, require but a very brief interval of The number of the wanted line has thus been recorded on the reg-istersender and since the register controller is in position 9,

a circuit isnow completed from grounded battery, winding, armature and back Contact of the motor magnet 49, right hand armature and front contact of relay 48, brush 47 in position 9., register selector brush 68, conductor 69, lowermost armature-and front contact of relay 29, outer front contact and'armature of relay 2% and office lamp 27 to ground. The lighting of the oflice lampis an indication that the number is properly recorded, so that the operator now inserts the calling plug of the cord circuit taken for use into the jack, such as 70, of the trunk leading to the wanted office. This operation closes a circuit fromground through the visual signal 71 and the sleeve contacts of the jack and plug-just referred to, continuity spring and back contact of relay l3, winding of the slow releasing relay 26, to grounded battery.- This operates the relay 26 to place the master keys shownin. the upper'right hand corner of Fig. 1, in condition to selectively operate the frequency .cuu'ent selecting relays 7 2 and 7 3, shown on the lower left hand side of Fig. 3. s M

hen the operator depresses a ringing key, such as 74, the slow releasing relay 75 controlled thereby is operated. This results in tne energization of the slow releasing relay '13 in a circuit extending from grounded battery, lower winding of the relay 13, right hand front contact and armature. of relay 26, inner front contact and armatureof relay 7 to ground. The relay 13 when thus operated closes a locking circuit for :itself through its upper armature and continuity spring to ground through the sleeve conntacts'of-fthe' plug and jack. I With the relays 26 and 75. actuated, a circuit is closed from Z grounch'outer armature and front contact of relay '75,.outerinost contact and armature of relay 26, conductor 53., selector brush 54,

the cord circuit now in use.

conductor L2, controller brush 4-1 in its ninth position, conductor "76, winding of relay T2 to grounded battery. The frequency selecting relay 72 is thus operated and locks itself actuated in :the common locking circuit completed to ground at controller brush l9. If

ringing key 77 had been depressed then circuits would have been completed for operating both of the ringing frequency selecting relays 72 and 73. Since the operation of the relay 13 has opened the actuating circuit of the slow releasing relay 26, this last named relay aftera short interval retracts its armatures. This is effective to connect the register sender to the calling end of the cord circuit. The release of the relay26 is also effective to advance the register controller switch into position over a circuit from ground at the innermost armature and back contact of relay26, lowermost armature and from contact of relay l8, lowermost front contact and armature of relay 29, conductor 69, selector brush 68, controller brush l? in its ninth position, right hand front contact and arn' ature of relay 48, back contact, armature and winding of motor magnet 49 to grounded battery. With the operation of the relay 18, the locking circuit for the oliice relay 2% which has been controlled at the lowermost back contact of relay 13 i opened, causing the operated office relay to release. Relay 13 at its inner back contact and ari'nature also opens the circuit which has been holding the relay 12, so that this last namedrel'ay releases and extinguisher the supervisory lamp 9, which has been dimly lighted to indicate to the operator that her telephone set has been in connection with The release of the relay 12 in turn opens the circuit of the slow releasingrelay 15, which likewise retracts its armatures to disconnect the operators telephone set from the cord circuit that is being described.

At this time relay 11 also deenergize's to restore the common relay 10 to common use in connection with the so-called operation of .advance plugging in. .he relays and 29. are held operated after the release of the relay 12 by a. circuit completed from grounded battery, resistance, left hand armature ,and front contact of relay 2', inner left hand armature and front contact of relay 20, winding of this relay to ground and in multiple with this'last 'describedcircuit, relay 29 is heldoperated over conductor 80, winding of relay 29 its continuity spring and armature to ground; Atthis time a circuit is closed over the ring side of the selected trunk, from grounded battery through both wlndlngs in series of relay 78 of Fig. 3, controller brush in its tenth position, conductor 79, selector brush 80, middle armature and back contact of relay 26, inner, upper,

front contact and armature of relay 29, ring net 88, which advances the receiver controller switch into position In this position the high resistance winding of relay 96 is included in this circuit with the low resistance winding 100 in Fig. 3, which causes this last named relay to release, at which time a circuit is closed from ground at its armature and back contact, controller brush l7, in its thirteenth position and thence through the remainder of the previously described circuit, through the motor magnet i9 to grounded battery. This advances the register controller into position 14, which completes a circuit from battery through the high and low resistance windings of relay 78 over trunk R and thence through the windings of relay 96 to battery so that re lay 96 deenergizes. Relay 96 on deenergization moves the receiver switch into position 6.

From the foregoing it will be seen that the relays 78 and 100 of Fig. 3 and the relays 95 and 960i Fig. 2 are actuated through a series of operations, whereby the register switch of Fig. 3 is first advanced and then the receiver switch of Fig. 2, is advanced. In other words the receiver switch lirst prepares a circuit for advancing the register switch and then the advance of .the register switch completes a circuit for advancing the receiver switch. This alternate operation of the two switches continues, until the register switch reaches position 27 and the receiver switch reaches position 19. In these positions a circuit is completed from ground through the high and low resistance windings of relay 95 and through the low resistance windingo'f the relay 78, for the lasttime so that relay 78 deenergizes and moves the register switch to position 28, after wiich relay 95 releases and movesthe receiver switch to position 20.

When the register control brush 49 reaches position 28 it closes a circuit from ground over conductor 101, left hand armature and front contact of relay 4.8, selector brush 102, through the outermost front, contact and armature of relay 20, which is effective to short circuit the relays 20 and 29. The relay 20 is slow releasing and retracts its armatures'more slowly than the relay 29 and thereby prevents the locking in operative.

condition of the relay 29. Then the relay 20 deenergizes it opens at its inner right hand front contact. and armature the cir-" .cuitwhich has been holding the relay 48 ture of this relay, conductor 101 and brush 49 to ground. This circuit advances the register controlswitch into its normal position. 7 Y

. I operated.

- line.

lVhile the register controller switch is passing through its eighteen positions from position 10 to 27 inclusive, as above described, it connects the tip side of the trunk to conductor 53 of Fig. 1 and the conductor 42 and brush &1 of Fig. 3, to the eighteen register relays, shown in the upper left hand corner of Fig. 3. The brush 103 of the receiver switch of Fig. 2, in passing through its eighteen positions from 2 to 19 inclusive, in synchronism with the register controller switch extends the tip side of the trunk to the eighteen call indicator relays, shown in the lower right hand corner of Fig. 2. In this progressive advancing of the register controller and the receiver switch, relays in the receiver switch circuit corresponding to the operated relays of the register sender are operated and locked.

It should be noted that the lamp indicator relays and the contacts of the register relays are alternately connected to ground and battery in order that-the overlap, when theregister controller switch moves to a succeeding position, will not falsely operate the indicator relays at the distant oh'ice represented at Fi 2,. The called number was assumed to be #4468 and it will be remembered from the preceding description that the thousands register relay 36, the hundreds register relay .365, the tens register relays-33 and 35 and the units register relays 33 3 F and 35 were The thousands indicator relay 10 is therefore operated, as well as the hundreds relay 105, the tens relays 106 and 107 and the units relays 110, 111 and 112 are likewise operated and locked over conductors ll l and 123. It will thus be seen that the #4 thousands lamp is lighted in a circuit, which may be traced from grounded battery, lamp #4, back contact and armature of relay 11-1, uppermost armature and front contact of relay 104E, uppermost back contact and armature of relay 112, to ground. In 2 the indicator lamps for the thousands indicator only are shown, since the lamps for the hundreds, tens and units indicato-rs are wired in the same manner as those of the thousands lamps. The circuit of the #4 thousands lamps, has been traced and it will be understood that the circuit for the #4 hundreds lamp is similar to that of the thousands lamp." With the tens relays 106 -and l07 operated, a circuit is closed for lighting the tens lamp #6 while with the units relays 110, 111 and 112 a circuit is closed for lighting the units lamp #3 only. Since the stations-relay 72 has been operated', the corresponding stations relay 113 of Fig. 2, is operated and locked over conductor 114 to light the stations lamp 115.

The B operator now inserts the calling plug 94 into a multiple jack of the called This is effective toenergize the slow releasing relay 89in a circuit closed from grounded battery, of this relay, in nermost back contact and armature ofrelay I 116, conductor" 11:7, sleeve contacts of the conductors from the tip and ring cn- 'tures and back contacts closes break points ductors of the/trunk, and; at its arma- 'in the tip and {ring conductors of the trunk. hen relay 81 deener'gizes it opens the circuit of rela y 91, shown in the-lower left hand cornerqor Fig. 12 andfthisf last i named relay retractsits armatures to close circuit tl'irough'receiver brush 87 for'advancing the receiver-into its normal posltion. The release of'the relay 91 also unlocks all of the 'indicator -relays of Fig. 2 that have been operated;v soon as the mentioned break pointsvare'closed in" the t p and ring conductors of the trunk, relay 119, shown near the-top the repeatingcoil andthe windings of relay 82 and, relay 120., Relay 119 willfnot operate in series with the high resistance Winding of relay82'but whenthe called party answers, "this high I'GSlStZlIdCQ wlndlng s short circuited, which permlts relay 119 to operatewfor the purpose "of glvlng super- "vision at the originating office] The B operator at the distant ofliceiafter connecting theplug 94 to theg calledtelephone line, depresses the-rniging key; 122

to s'elect the proper frequency for signaling the Wantedstation on line 2 as indicated by the statio11 lamp'-115.

the rin ing: key "122, efiects the operation of the slow releasing" relay 121, whlch 1n turn closes a circuit jfrom ground through the meter relay, inner armature and frOntjcontact of relay 121, conductor 130, lowermost,

armature" and frontjcontact of relay 89, upper winding of relay 116 to 'grounded' bau tery'. Relay 116 in operationfclosesa look- 3 I 'ing' circuit for itself through its lower winding, its inner front "contact and arma ture, conductor llTto ground throughrdllay 118., The relay 126isalso'operate time from grounded battery, res1stance,1ts

winding, lowermost front contactand armas ture of relay 89, "conductor 130- to' ground through the'meter re lay, Relay 128 is-li1 e wise 'actuatedat this tin ein a circuit which may be traced from grounded battery, w1nd-, ,ing of relay"128,;middle front, contact and armature of relay-89, conductor13l, outer from contact vand "armature" of. relay 121 to ground; WVith relays 126 and-128 operated,

; 66"cycle ringingcurrntuisapplied through lay 127, front contacts and garlnatures of relays 12 8 and8 3, winding ofsthetnp relay of Fig; i 1 has its cirouit closed in series with the two left hand windlngs of I The depression. of I o o ta-ct "of due relay, right hand through the inner time nact and 'za'rmature of relay 126, through the ring con- *tacts ot the p plug 94, and multiple jac'kof thercalledline over the lower side at this lineund through the hell at thewa'nted sub station, which is assumed to. be that shown in detail in Fig/2 over the upper side of the called line, tip contacts of the ad: and

plug, upper armature and front contact of relay 126 to ground; Ringing Current is'ap-b plied overthis circuit until the called party responds," at which time "the tripjrelay 125 is energized and 'at its frontcontactpand" armature closes a circuit by which the. rihgrelay 126 is shunted, causing'it to r'etra ct its armaturesg At thistime the super Wisory relay v129 is energized in a circuit completed over the two sides of the called end of the cord circuit and the called line in series. Att-he lower armature and front winding, of relay 82 is short-circuited, so

that the isupervisoryrelay 119of Fig. l, is

which ;rielay"is locked operated through its .l'et't' handrront contact and armature,lower- :rnost front contact and armature of'relay'13, :iiniern'iost back contact and armature of; re-

lay 126 to ground, All of thesup'ervisory lamps, of; Figures"; 1 and2, are now extinguished.

dNhen tliecalling subscriber terminates the replacing his receive'ron itsjswitch- 'hook,xthe answering supervisory'relay 8 .de-

energizes and causes the supervisory lamp 9 to be'lightedin a circuit the innerleft hand armature and back con- 7 armature and lfrontcontact of relay 7"through theii mpedance fcoil'to ground. This-is a signal to "the' 'A operator that the connection maybe "disestablished,whereupon she-removes the answering plug 5 f'and the calling plug of they have been in engagement;

closed through I no 7 this cord-'circuitfrom thejacks If the called: subscriber terminates the energizes and removes the shorticir'cuit battery, right hand armature and o front contact of relay1 24, back'contact and armature of relay 119 to ground. Thisis also a sig- 11211 to the A operator toqdisestablish the-con fnection', which'she does by removing the. p I plugs fromfthe jacks with whicljrtheyv have. f -.:the"inner backc0n flCt and'a m ure o re "connection, the supervisory relay l29 de-" f from about'the-high resistancewinding of a relay 82 'andwhe 'i this high resistanceWind-v ;ing"is againincludedj in serieswith theree lay 119 of Fig. 1, it'causes this last named I een engagement. At" the B: tgg

position" when the" superrisory relay 1 29 85 contacitlof this relay, the high resistance o lighted in a circuit closed through the "lower arinature 'antl front" contactot' "fe- "relay ll6,' back contact-"and ai'n aturc bf'relays 83' and 129 to grourid. The liglitiiig *ot' the lainp 8 t'is also a signal to the B: operator" to dises'tablish the connection "'re- "n'iovin'g 'tlie'plug 94 from thefcalle'd jack.

terconnecting' said'ftelephone lines, line designationrecording means-at said llnk cirlfIn atelephOne system, a pluralityof telephone lines, alink circuit foruse in in- "cuit-includinga plurality of selectively and "variably operable "devieesin which several "portions'ot' a line te'les'ignati on are recorded,

fineans including a 'si'i'i'gle pair of operated contacts,,:tor selectlvely operating said devices nrresponse' to a s ngle connecing'said "oliicesfnieans for connectingatele- "phone line" to one end or one of said link circuits, and means for connecting other end of said link circuit to'anothe'r telephone line, a recortlhig device at one of said otlices, said recording deviceincluding a plurality of selectively and variablyoperable mecha- 7 nisnis, a"si'gnaling"devic'e at the other of said offices arranged to be variahlyoperated under the control of'said' recording device to indicate the" numberof the Wanted-line, and means includinga single pair oit manually coiitroll'ed "contacts for selectively operating several mechanisms of said'lr ecording tlevice,'.ii1' response-t6 a single actuation of said pair. ofcontacts.

In a" telephone system, a plurality of telephone linesi'a plurality of link circuits,

I eaclr'offwhi'cli .may'be used for interconnecting said"telephone lines, a plurality of register senders" common to said Tlink circuits, each register sender including plurality of selectively and'yariahly operable registers, means for associating an idle register sender with a link circuit taken for use, and means including 'a single p air 'of contacts torfoper atingdhe' registers of'a selected register sender iii response'toa single actuatipn of said pair o'f contacts.

l-.1111 a" telephone system, a plurality of telephone linesfa'link circuit for use in interco nn'ecting' said telephone lines. amani1allyopeiable switch having contacts for extending said li-nk circuit in the direction oratelepiwneiihe, a register sender having a plura'lit'y of variahly opetable registers, mammalsincluding aqsinglepair of, manually operated ico rit-acts for selectively 0peratingisaid registers in responseto a single operation of saidrpair of contacts,'said single pair of contacts includ ng one contaetof sai c l'inja'nual' switch. i

Inia telephone system, a plurality of telephone lines, a link circuit for use in interconnecting said telephone lines, said link circuit" terminating at one end in a manual switch, a registersender provided with a of variably oper'ahle reg sters associated With said link clrcuit, a. contact for etch of thetelephone lines of a group of aid line's, and' neans including a contactof said manual switch and the individual contact or the Wanted telephone line for selectively operating the registers of said register s ender in accordance With the Wanted telephone line. 6. Ina telephone system, a plurality of telephone lines, a link clrciiit eonnectable to awanted telephone line, a cord circuit providediyith a manual switch for extending waning telephone line to the other end of said lijrk circuit, an indicator device at said link ciicuit, a i egister s ender arranged to associated with a cord circuit, said register sex ler b e Pr id 'W th a p ra i y o e i ter f r l qtii yi Gre s sa d ndicating device, and means including a contact individual to a wanted telephoneline and a ent b f h m nu sw t h f. s dv o -i circa it for selectively operating said registers. V i l i In a t l ph ee sys m e i rality f telephne nes link ircuit f r nt rco ne e i a d-te ep e e li te sen hav plur i y :Q ei t is arrang r l t be esse t e w t s d in uit, a od mac n tqmmon to aplum ity f t ep on lines selectively and variably actuating t e re ste f a g ste sende d e n r snqns v t a ng astu iq f a s ngl pair'of tei' nin alsior controlling the setting of said registers by said code machine.

8- In a telephon sys m, te ep o ine link c rcui or inter nne g said telephone lin'es, a register sender provided with plurality Qf registers, a code impulse machine common to a plurality of telephone lines, means including a. sequence device for placing the registers of a sender successively undertlie control of said, code impulse machine, and, means including a 'singlepair of manually operated contacts for controlling said registers ftom said impulse machine' ;9 111 13 telephone system, a plurality of telephone lines, linkcircuit for use in'inte fconnecting saidtelephone lines, a register Sender provided with plurality of variably operable registers con'nectable to said link circuit," an individual"contact for each of certain of said telephone lines, and means cooperating with the individiial contacts of Wanted telephone'line for selectively o era'tingthe-re'gisters of saidregister senc er in accordance "with the designation of :the

Wanted; telephone *linef the designation 9 10. Ina telephone system, a' plurality of telephonelines, link circuits for use in in- I terconnecting, said telephone lines, "a plurality of register senders each provided With arplurality of variably operable registers, means for connecting an idle register sender to a linkcircuit takenfor use in interconnecting said telephone. lines, an individual f contact for each of certain of said telephone lines, and means including, the individual contact of the wanted telephone line for se lines, means for extending said link circuits 7 i to said telephone lines fwhen they originate calls, an operators. telephone set, automatic means for connecting in succession said operators telephone set to extended link circuits, means for indicat n to which llnk c1rcu1t anoperators telep one set is connected, a plurality of register senders each provided with a plurality of variably operable registers, means for connecting an idle reglster sender to the link CIT-Cult to which said operators telephone set is connected, an individual contact for each of certain of said telephone lines, and means including the individual contact of the Wanted line for selectively operating the .registers of said last mentioned register sender in accordancewith the designation of the wantedtelephone line.

12. In "a telephone system, a plurality of telephone lines,a plurality of link circuits, 7

telephone lines contemporaneously originating calls, an operators telephone set, auto matic means for connecting said operators telephone set to said last mentioned link circuits oneat a rtime, a plurality of register senders each provided with a plurality of variably operable registers, means for connecting an idle register sender to anextended link circuit, an individual contact for each ofcertain of saidtelephone lines, and 7 means including the individual contact of the wanted telephone line for operating'sa lectively in accordance with the designation of the wanted telephone line, the registers of the register sender connected to the link circuit associated with said operators telephone set.

In witness whereof, I hereunto subscribe my name this 14th day of March, A. D. 1924.

WINFRED T. POWELL;

means vfor extending said link circuits to y 

